| With the rapid development of our economy,a large number of deep foundation pit apperanced.In order to ensure the stability and safety of deep foundation pit in the process of construction,site monitoring and numerical simulation are of great value.In this paper,based on the tunnel engineering of the Xiamen Guanxin Road,the method of combining theoretical analysis,site monitoring and numerical simulation is adopted to compare and analyze the deformation law of deep foundation pit,and the main contents of this paper are as follows.(1)The research status of development and monitoring of foundation pit engineering at home and abroad was introduced.The mechanism and influencing factors of foundation pit deformation,purpose and method of foundation pit monitoring were introduced.(2)The development of the on-site monitoring program for this project was introduced,and the entire process of excavation was monitored,including deep horizontal displacement,settlement and horizontal displacement of the envelope,stress of the main structural floor slab and changes in the groundwater level.Based on a certain section of the project,FLAC~3DD was used to establish a numerical simulation model.Under the fluid-structure interaction model,relevant data such as settlement,uplift,horizontal displacement and axial force of the engineering pile after excavation were analyzed.(3)Through numerical simulations,the connection between the depth of water curtain and the basal bulge was explored to verify the role of the water stop curtain in reducing the basal uplift.,explore the setting depth of the best water-proof curtains based on the engineering geology of the project site.(4)Through numerical simulation,the effects of uneven settlement of underlying soil layers and engineering piles at different depths on the tunnel floor were compared and simulated to investigate the effect of engineering piles on the differential settlement in the longitudinal and transverse directions of the tunnel. |
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